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Search: id:A008392
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| A008392 |
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Crystal ball sequence for A_8 lattice. |
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+0
4
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| 1, 73, 1405, 13237, 79459, 350683, 1240399, 3716695, 9793891, 23301307, 51019255, 104285215, 201186025, 369464785, 650284045, 1102999717, 1811113021, 2889580645, 4493676169, 6829608673
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Comment from T. D. Noe, Apr 29 2007: For the formula to produce this sequence, the four minus signs should be pluses and a 1 should be added: 143/448*n^8+143/112*n^7+2431/480*n^6+429/40*n^5+3355/192*n^4+297/16*n^3+22079/1680*n^2+761/140*n+1;
Comment from njas, May 04 2007: In that case I need to recheck both the formula and the values to see which is correct.
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LINKS
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T. D. Noe, Table of n, a(n) for n=0..1000
Index entries for crystal ball sequences
J. H. Conway and N. J. A. Sloane, Low-Dimensional Lattices VII: Coordination Sequences, Proc. Royal Soc. London, A453 (1997), 2369-2389 (Abstract, pdf, ps).
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MAPLE
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143/448*n^8-143/112*n^7+2431/480*n^6+3355/192*n^4+22079/1680*n^2-429/40*n^5-297/16*n^3-761/140*n;
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CROSSREFS
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Sequence in context: A057522 A008400 A090685 this_sequence A098676 A056214 A017789
Adjacent sequences: A008389 A008390 A008391 this_sequence A008393 A008394 A008395
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KEYWORD
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nonn
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AUTHOR
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njas and J. H. Conway (conway(AT)math.princeton.edu)
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